未在EF4设计器中导入非主键的关联

Question

关系'FK_EXTERNAL_ISMARKETI_MARKETIN'的列不属于关系主要一侧表的键的一部分。这种关系被排除在外。

USE [Instruments.UnitTest]     GO

ALTER TABLE [Instr].[ExternalIdentification]  WITH CHECK ADD  CONSTRAINT [FK_EXTERNAL_ISMARKETI_MARKETIN] FOREIGN KEY([InstrumentID], [MarketInstrumentID])
REFERENCES [Instr].[MarketInstrument] ([InstrumentID], [MarketInstrumentID])
GO

ALTER TABLE [Instr].[ExternalIdentification] CHECK CONSTRAINT [FK_EXTERNAL_ISMARKETI_MARKETIN]
GO

我正在使用 NON-PRIMARY KEY 列的关联，这在EF4中是否可行？

Answer 1

EF v4不支持此类关联。

Answer 2

这篇文章中有更详细的解释

http://www.cognitiveinheritance.com/post/Using-the-Entity-Framework-with-databases-that-have-foreign-key-relationships-that-do-not-link-to-the-primary-key-of-the-child-element.aspx